Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
5th Edition
ISBN: 9781305084766
Author: Saeed Moaveni
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 7, Problem 21P
To determine
Determine the frontal area of the car.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The air resistance to the motion of a vehicle
is something important that engineers
investigate. As you may also know, the
drag force acting on a car is determined
experimentally by placing the car in a wind
tunnel. For a given car, the experimental
data is generally represented by a single
coefficient that is called the drag coefficient.
It is given by the relationship:
Fa
C, =
where
C, = drag coefficient
F, = measured drag force (Ib)
p = air density (slugs/ft')
V = air speed inside the wind tunnel (ft/s)
A = frontal area of the car (ft²)
What is the appropriate unit for C, if the
preceding equation is to be homogeneous in
units? Show all steps of your work.
3. The drag force of an object moving through a fluid is found to be FD = CpAv² where Cis
the drag coefficient, A is the area of the object facing the fluid, and p is the density of the
fluid. The drag coefficient is determined experimentally. Using this form of the drag force,
calculate the terminal velocity of a 75 kg skydiver in 2 positions: diving head first like an
arrow (C=0.70, A=0.18 m²) and laying horizontal (C=1.0, A=2 m²). The density of air is
p = 1.21 kg/m³.
DYNAMICS OF RIGID BODIES
Two masses of 14 kg and 7 kg connected
by a flexible inextensible cord rest on a
smooth plane inclined 45° with the
horizontal as shown in the figure. When
the masses are released, what will be the
tension T in the cord? Assume the
coefficient of friction between the plane
and the 14-kg mass is 1/4 and between
the plane and the 7-kg mass is 3/8?
7 kg
14 kg
450
Chapter 7 Solutions
Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
Ch. 7.2 - Prob. 1BYGCh. 7.2 - Prob. 2BYGCh. 7.2 - Prob. 3BYGCh. 7.2 - Prob. 4BYGCh. 7.2 - Prob. 5BYGCh. 7.2 - What does strain represent?Ch. 7.2 - Prob. BYGVCh. 7.5 - Prob. 1BYGCh. 7.5 - Describe two different methods that you can use to...Ch. 7.5 - Prob. 3BYG
Ch. 7.5 - Prob. 4BYGCh. 7.5 - Prob. 5BYGCh. 7.5 - Prob. BYGVCh. 7 - Prob. 1PCh. 7 - Prob. 2PCh. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Prob. 5PCh. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Investigate the diameter of the electrical wire...Ch. 7 - Prob. 12PCh. 7 - Prob. 13PCh. 7 - Prob. 15PCh. 7 - Prob. 17PCh. 7 - Using area as your variable, suggest ways to cool...Ch. 7 - Prob. 19PCh. 7 - Prob. 20PCh. 7 - Prob. 21PCh. 7 - Prob. 22PCh. 7 - Prob. 23PCh. 7 - Prob. 24PCh. 7 - Prob. 25PCh. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - Prob. 28PCh. 7 - Prob. 30PCh. 7 - Prob. 31PCh. 7 - Prob. 32PCh. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - Prob. 38PCh. 7 - Prob. 39PCh. 7 - Prob. 40PCh. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - A 10 cm long rectangular bar (when subjected to a...Ch. 7 - Prob. 44PCh. 7 - Prob. 45PCh. 7 - Prob. 46PCh. 7 - Prob. 47PCh. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Prob. 50P
Knowledge Booster
Similar questions
- 14.11. As we explained in Chapter 7, the air resistance to motion of a vehicle is something important that engineers investigate. As you may also know, the drag force acting on a car is determined experimentally by placing the car in a wind tunnel. The air speed inside the tunnel is changed, and the drag force acting on the car is measured. For a given car, the experimental data is generally represented by a single coefficient that is called drag coefficient. It is defined by the following relationship: Fa Cả where Ca = drag coefficient (unitless) Fa = measured drag force (N or 1b) p= air density (kg/m³ or slugs/ft') V = air speed inside the wind tunnel (m/s or ft/s) A = frontal area of the car (m? or ft') The frontal area A represents the frontal projection of the car's area and could be approximated simply by multiplying 0.85 times the width and the height of a rectangle that outlines the front of a car. This is the area that you see when you view the car from a direction normal to…arrow_forwardd) The viscosity of a fluid is to be measured using a viscometer constructed of two 750 mm long concentric cylinders. The outer diameter of the inner cylinder is 150 mm and the gap between the two cylinders is 1.2 mm. The inner cylinder is rotated at 200 rpm and the torque is measured to be 10 Nm. a) Derive a generals expression for the viscosity of a fluid using this type of viscometer, and; b) Determine the viscosity of the fluid for the experiment above. Shaft е -Cylinder - Velocity Profilearrow_forwardFor the drag coefficient relationship given in Problem 6.24, if the units of Fd , V, A, and Cd , are expressed in N, m/s, m2 , and unitless, respectively, what are the appropriate units for ρ?arrow_forward
- Please answer it correctlyarrow_forwardH4.arrow_forward6. a. Explain (include diagrams) the following components of Total drag on a solid object placed in a moving fluid. Include in your discussion how these components vary as the orientation of the object changes in the flow field: i) Pressure Drag ii) Friction Drag b. An antenna in the shape of a cylindrical rod projects from the top of an automobile. If the antenna is 106 cm long and 50 mm in diameter, calculate the drag force on it when the automobile is travelling at a velocity of 7.5 m/s in still air at -20°C Assume the surface of the structure is smooth. Page 4 of 8 D = 2 Copv²A %3Darrow_forward
- In order to transfer two rectangular packages as shown in the figure below, an 8-kg steel wagon is used along a smooth floor. The masses of Packages 1 and 2 are mp₁ = 25 kg and mp2 = 20 kg, respectively. The coefficients of static friction and kinetic friction between Package 1 and Package 2 are μ = 0.3 and μ = 0.2, respectively. The coefficients of static friction and kinetic friction between Package 2 and the wagon are μ = 0.40 and μ = 0.25, respectively. If a pulling force of F = 15 N is applied on the steel wagon handle as shown, determine if Package 1 will slip before it will tip. Explain your answer. Take note that Package 2 will slip before it will tip. 350 mm 1 600 mm 650 mm 2 750 mmarrow_forwardFor each problem, one curved surface is shown restraining a body of static fluid. Compute the magnitude of the horizontal component of the force, and compute the vertical component of the force exerted by the fluid on that surface. Then, compute the magnitude of the resultant force and its direction. Show the resultant force acting on the curved surface. In each case the surface of interest is a portion of a cylinder with the length of the surface given in the problem. Referring to figure 5, the surface if 2.00 long. Water 1.85m 0.75m radiusarrow_forwardAn object weighing 400 N is held by a rope that passes over a horizontal drum. The coefficient of friction between the rope and the drum is 0.25. If the angle of contact is 150 degrees, determine the force that will raise the object.arrow_forward
- Please help me answer this question and please show the solution for each indicated problem. A pitcher throws a fast ball that is moving at a speed of 80 mph. The batter hits the ball in the direction shown. The ball leaves the bat at a speed of 190 mph. If the bat and the ball are in contact for 0.030 seconds, determine the average impulse force exerted on the ball by the batter during the impact. The ball weighs 0.40 lbs.arrow_forwardQuestion 4 The macroscopic model developed by Drake et al. (1967) proposed the following equation to express the relationship between speed and density: ● v = vfe A traffic engineer calibrated the model using empirical data and the model parameters were estimated as follows: The free-flow speed (vf) = 110 km/h The density at capacity (km) = 30 veh/km Answer the following questions: 2 (二)ㄕ a) Develop an equation to express the flow (q) as a function of the speed (v). b) Using the equation developed in the previous question, plot the q-v relationship, with (v) on the horizontal axis and (q) on the vertical axis. (Show all critical values on your plots). c) Calculate the average headway and the average spacing corresponding to the capacity.arrow_forwardSubject: Dynamics of rigid bodies Topic: Connected Particles Box final answer Auto like Note: Answer in three decimal Placesarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Engineering Fundamentals: An Introduction to Engi...Civil EngineeringISBN:9781305084766Author:Saeed MoaveniPublisher:Cengage Learning
Engineering Fundamentals: An Introduction to Engi...
Civil Engineering
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Cengage Learning